O'clock rhymes with:
clock, kloc, klock, klocke, antilock, bloc, bloch, block, blok, clock, floc, flock, glock, interlock, kloc, klock, klocke, laack, laake, loch, lock, locke, lok, ploch, plock, schlock, unlock, vlok
O'clock sounds like:
oakley's, ogles, okaloosa, oscalus, ossicles, oxalis, ozal's, ozols